<?php
/** 语音识别例子**/
echo "<script type='text/javascript' language='javascript' src='http://res.wx.qq.com/open/js/jweixin-1.0.0.js'></script>";
define("TOKEN", "weixin");
$wechatObj = new wechatCallbackapiTest();


if (!isset($_GET['echostr'])) {
    $wechatObj->responseMsg();
}else{
    $wechatObj->valid();
}

class wechatCallbackapiTest
{
        public function valid()
        {
            $echoStr = $_GET["echostr"];
            
            if($this->checkSignature()){
                echo $echoStr;
                exit;
            }
        }

        private function checkSignature()
        {
            $signature = $_GET["signature"];
            $timestamp = $_GET["timestamp"];
            $nonce = $_GET["nonce"];
    
            $token = TOKEN;
            $tmpArr = array($token, $timestamp, $nonce);
            sort($tmpArr);
            $tmpStr = implode( $tmpArr );
            $tmpStr = sha1( $tmpStr );
    
            
            if( $tmpStr == $signature ){
                return true;
            }else{
                return false;
            }
        }
    
        public function responseMsg()
        {
            $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
    
            if (!empty($postStr)){
                $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
                $fromUsername = $postObj->FromUserName;
                $toUsername = $postObj->ToUserName;
                $keyword = trim($postObj->Content);
                $time = time();
                $textTpl = "<xml>
                            <ToUserName><![CDATA[%s]]></ToUserName>
                            <FromUserName><![CDATA[%s]]></FromUserName>
                            <CreateTime>%s</CreateTime>
                            <MsgType><![CDATA[%s]]></MsgType>
                            <Content><![CDATA[%s]]></Content>
                            <FuncFlag>0</FuncFlag>
                            </xml>";
                if($keyword == "?" || $keyword == "？")
                {
                    $msgType = "text";
                    $contentStr = date("Y-m-d H:i:s",time()).'TTTTTTTTTTTTTTTTTTTT';
                    $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
                    echo $resultStr;
                }
            }else{
                echo "";
                exit;
            }
        }
}
?>